CG exercize
In the FWIW dept, heres the formula for doing a sure nuf CG check.
1. All 4 suspension points must be made solid, as in rods to replace the shocks.
2. The tires must be HARD.. to prevent deflection.
3. The gas tank has to be either totally full or completely empty.
4. Place the car on 4 wheel scales.
5. Read and record all 4 scale readings.
6. Jack the rear end up 10 inches as measured at the CL of the wheel.
7. Read ft wheel wts and record.
8. Subtract the 2 ft wts and record the total.
Hcg = change in ft wt X wheel base X cos of the tilt angle divided by total wt of vehicle X sin of the tilt angle.
Tilt angle = tan O=10 divided by the WB.
sorry I don't have a engineering keyboard!! DUH
Also: Gm engineering has stated for the "average" calcs, you can use the following:
passenger cars = 20 to 21"
12 - 13" formula cars.
16 - 18" sports racing.
ALSO, [Again!!]
There is a visual that can help understand where the anti squat is on a particular car. It involves watching the tires on launch. It goes something like this:
Tire wrinkles at the bottom = A/S is high. [6 o'clock]
" " " " front = A/S is low. [3 to 4 o'clock]
Further observation can tell something about pressures.. right or too low.
Correct PSI = wrinkles at the ft and towards the bottom. [5 o'clock]
Low PSI and Excessive anti squat = wrinkles at the bottom and excessively long footprint. IE: the rim is driven into the track.
just some "stuff" from the ancient one!!!
Stay tuned to this 'NBS" station for more in the ongoing saga of "Captain HOOK" !